I need your guys opinion?

I made the worst mistake of my life. I wasted my time with this girl who was damaged by spending time and money and now I want to try and limit our contact but she told me she want's to be friends. I don't want to be friends because it'll be to painful. What do i do? I got rid of her number but she's bound to text me for school and someone in her family died and she's expecting me to come over. She told me she started seeing someone on my birthday so it's recent. I don't know if its her ex or not but I need to get away from this without being rude about it. How do i do it?
I need your guys opinion?
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